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SAE-AISI 5140 Steel vs. SAE-AISI A6 Steel

Both SAE-AISI 5140 steel and SAE-AISI A6 steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 5140 steel and the bottom bar is SAE-AISI A6 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Tensile Strength: Ultimate (UTS), MPa 560 to 970
750 to 1990

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 45
41
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
7.5
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
3.7
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.8
Embodied Energy, MJ/kg 19
24
Embodied Water, L/kg 49
57

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 20 to 34
27 to 71
Strength to Weight: Bending, points 19 to 28
23 to 45
Thermal Diffusivity, mm2/s 12
11
Thermal Shock Resistance, points 16 to 29
25 to 65

Alloy Composition

Carbon (C), % 0.38 to 0.43
0.65 to 0.75
Chromium (Cr), % 0.7 to 0.9
0.9 to 1.2
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 97.3 to 98.1
93 to 95.8
Manganese (Mn), % 0.7 to 0.9
1.8 to 2.5
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0 to 0.030

Comparable Variants